Principal, Software Engineer (L5) @Twilio

Overview

Twilio is shaping the future of communications through innovative solutions. The company is committed to remote-first work and fostering a culture of connection and global inclusion.

Key Responsibilities

• Design and deliver components of Twilio's carrier test and observability platform, covering active voice and messaging testing.
• Build data and alerting systems for operations teams.
• Extend production LLM systems for automated carrier troubleshooting.
• Diagnose cross-boundary failures in carrier behavior and establish observability.
• Contribute to technical design, mentor engineers, and help shape standards.

Requirements

• 12+ years of software engineering experience with expertise in large-scale systems.
• Deep knowledge of distributed systems for processing high-volume time-series or event data.
• Hands-on experience with LLM-based systems in production.
• Strong proficiency in a backend language (Java, Go, Scala) and familiarity with event streaming and cloud infrastructure.
• Ability to communicate complex technical trade-offs effectively.

Benefits

Twilio offers competitive pay, generous time off, parental and wellness leave, healthcare, a retirement savings program, and more. Benefit offerings vary by location.

Location

Remote - Ireland

How to Apply

To apply, please submit your application through the Twilio careers page.

Deadline

No specific deadline mentioned.